Electrostatic assembly/disassembly of nanoscaled colloidosomes for light-triggered cargo release

Area of Science:

• Materials Science
• Nanotechnology
• Supramolecular Chemistry

Background:

• Colloidosome capsules are promising for cargo encapsulation and release.
• Conventional stabilization via covalent crosslinking limits cargo release applications.
• There is a need for stimuli-responsive colloidosomes for controlled release.

Purpose of the Study:

• To design and synthesize light-responsive nanoscaled colloidosomes.
• To enable controlled release of encapsulated cargos using light triggers.
• To overcome the limitations of irreversible crosslinking in traditional colloidosomes.

Main Methods:

• Electrostatic assembly of organosilica nanoparticles (NPs) with varying nitrophenylene-alkoxysilane (NB) content.
• Utilizing surface charge reversal of NPs triggered by light-induced photoreaction in NB moieties.
• Investigating the disassembly of colloidosomes and cargo release mechanisms.

Main Results:

• Successfully fabricated nanoscaled colloidosomes via electrostatic assembly of oppositely charged organosilica NPs.
• Demonstrated light-triggered surface charge reversal of NPs due to NB photoreaction.
• Achieved light-induced disassembly of colloidosomes and subsequent cargo release.

Conclusions:

• Developed a novel method for creating light-responsive colloidosomes without covalent crosslinking.
• The electrostatic assembly and light-triggered disassembly offer a versatile platform for controlled cargo delivery.
• This approach expands the application scope of colloidosomes, particularly for large cargo release.